SYMBOLCOMMON_NAMEaka. SYNONYMS
win.starcruft (Back to overview)

StarCruft

Actor(s): APT37


There is no description at this point.

References
2016-06-17Kaspersky LabsCostin Raiu, Anton Ivanov
@online{raiu:20160617:operation:2dfcedd, author = {Costin Raiu and Anton Ivanov}, title = {{Operation Daybreak}}, date = {2016-06-17}, organization = {Kaspersky Labs}, url = {https://securelist.com/operation-daybreak/75100/}, language = {English}, urldate = {2019-12-20} } Operation Daybreak
StarCruft APT37
Yara Rules
[TLP:WHITE] win_starcruft_auto (20201023 | autogenerated rule brought to you by yara-signator)
rule win_starcruft_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.starcruft"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 0fb711 83fa22 740b 8b45fc 0fb708 83f927 7537 }
            // n = 7, score = 100
            //   0fb711               | movzx               edx, word ptr [ecx]
            //   83fa22               | cmp                 edx, 0x22
            //   740b                 | je                  0xd
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   0fb708               | movzx               ecx, word ptr [eax]
            //   83f927               | cmp                 ecx, 0x27
            //   7537                 | jne                 0x39

        $sequence_1 = { 8b450c 50 8b4df8 51 e8???????? 83c40c 8b5518 }
            // n = 7, score = 100
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   50                   | push                eax
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b5518               | mov                 edx, dword ptr [ebp + 0x18]

        $sequence_2 = { 50 ff15???????? 6a04 6800100000 8b4da8 51 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6a04                 | push                4
            //   6800100000           | push                0x1000
            //   8b4da8               | mov                 ecx, dword ptr [ebp - 0x58]
            //   51                   | push                ecx

        $sequence_3 = { 8b55fc 0fb702 50 e8???????? 83c404 85c0 740b }
            // n = 7, score = 100
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   0fb702               | movzx               eax, word ptr [edx]
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd

        $sequence_4 = { 034dd0 8b55f4 8d840a4f7ea86f 8945f4 8b4df4 c1e106 8b55f4 }
            // n = 7, score = 100
            //   034dd0               | add                 ecx, dword ptr [ebp - 0x30]
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   8d840a4f7ea86f       | lea                 eax, [edx + ecx + 0x6fa87e4f]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   c1e106               | shl                 ecx, 6
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]

        $sequence_5 = { c685bffafffffb c685c0faffff89 c685c1faffff34 c685c2faffffb8 c685c3faffffc2 c685c4faffff1a c685c5faffffa6 }
            // n = 7, score = 100
            //   c685bffafffffb       | mov                 byte ptr [ebp - 0x541], 0xfb
            //   c685c0faffff89       | mov                 byte ptr [ebp - 0x540], 0x89
            //   c685c1faffff34       | mov                 byte ptr [ebp - 0x53f], 0x34
            //   c685c2faffffb8       | mov                 byte ptr [ebp - 0x53e], 0xb8
            //   c685c3faffffc2       | mov                 byte ptr [ebp - 0x53d], 0xc2
            //   c685c4faffff1a       | mov                 byte ptr [ebp - 0x53c], 0x1a
            //   c685c5faffffa6       | mov                 byte ptr [ebp - 0x53b], 0xa6

        $sequence_6 = { 6a36 8b4d08 83c158 51 e8???????? 83c40c 6a40 }
            // n = 7, score = 100
            //   6a36                 | push                0x36
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   83c158               | add                 ecx, 0x58
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a40                 | push                0x40

        $sequence_7 = { c1e115 8b55fc c1ea0b 0bca 034df8 894dfc 8b45f0 }
            // n = 7, score = 100
            //   c1e115               | shl                 ecx, 0x15
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   c1ea0b               | shr                 edx, 0xb
            //   0bca                 | or                  ecx, edx
            //   034df8               | add                 ecx, dword ptr [ebp - 8]
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_8 = { 8b55fc 895104 8b45fc a3???????? }
            // n = 4, score = 100
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   895104               | mov                 dword ptr [ecx + 4], edx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   a3????????           |                     

        $sequence_9 = { ff15???????? 85c0 7513 8b550c c70250000000 b801000000 e9???????? }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7513                 | jne                 0x15
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   c70250000000         | mov                 dword ptr [edx], 0x50
            //   b801000000           | mov                 eax, 1
            //   e9????????           |                     

    condition:
        7 of them and filesize < 294912
}
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